Note: Descriptions are shown in the official language in which they were submitted.
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SPECIFICATION
BONDED STRUCTURE, ROOF STRUCTURE, LAMINATED SHEET FOR USE THEREIN,
AND METHOD OF USING LAMINATED SHEET
BACKGROUND OF THE INVENTION
[0001]
The present invention relates to a bonded matter, a roof
structure, a laminated sheet used for the same and a use
method of the laminated sheet, specifically to a bonded matter
in which bonding can be released when heated, a roof structure,
a laminated sheet used for the same and a use method of the
laminated sheet.
RELATED ART
[0002]
In a production line for automobiles, assembling and
adhesion of car body panels constituted by outer plate panels
such as roof steel plates and the like and reinforcing inner
plate panels such as stiffeners and the like are carried out.
That is, a steel plate on which a rust preventive oil is
attached is cut and subjected to press processing, and then a
mastic adhesive (called as well a mastic sealer) is coated on
one of an outer plate panel and an inner plate panel obtained.
The other panel is superposed thereon, and the panels are
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fixed and bonded. As described above, a mastic sealer (refer
to, for example, a patent document 1) is used for assembling,
adhesion and bonding of car body panels.
Next, the above car body panels are mounted in a car body,
and then steps of alkali immersion and warm water shower are
repeated several times in order to remove a rust preventive
oil. Thereafter, steps of chemical treatment and shower
washing, electrodeposition coating and then curing of the
electrodeposition coating material by baking are carried out,
and the mastic adhesive is cured as well at the same time.
Then, middle coating, finish coating and surface coating are
carried out.
In recent years, a reduction in a weight of cars is
particularly required, and as a part thereof, application of a
high tension material (a plate is thin and has a rigidity) as
a roof steel plate is promoted. In this case, a difference in
a thickness of a roof steel plate and a stiffener and a little
contraction of a mastic sealer bring about distortion in a
certain case in a part in which the roof steel plate having a
small thickness is bonded by the mastic sealer after coated
and dried.
The above phenomenon is not necessarily brought about in
all parts bonded by the mastic sealer, and therefore a mastic
sealer bonded part at a site where distortion is generated as
a result of the structural analysis is cut by means of a knife
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to thereby cope with the above matter.
Patent document 1: Japanese Patent Application Laid-Open No.
302755/2007
DISCLOSURE OF THE INVENTION
[0003]
The present invention has been made in order to solve the
problems described above, and an object thereof is to provide
a bonded matter in which bonding can be released when heated,
a roof structure, a laminated sheet used for the same and a
use method of the laminated sheet.
[0004]
Intensive researches repeated by the present inventors in
order to solve the problem described above have resulted in
finding that the object described above is achieved by
providing a laminated sheet which can be peeled off when
heated between a first member and a second member, and thus
the present invention has been completed.
(00053
That is, the present invention provides a bonded matter
prepared by bonding a first member to a second member with a
laminated sheet, wherein a contractile film constituting the
above laminated sheet contracts when the bonded matter is
heated, and a part of the laminated sheet is peeled off or the
laminated sheet is peeled off from the member, whereby the
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bonded matter is prevented from being deformed.
Further, the present invention provides a roof structure
prepared by bonding a stiffener for cars and a roof for cars
via a mastic sealer and a laminated sheet, wherein when the
above roof structure is heated, a part of the laminated sheet
is peeled off or the laminated sheet is peeled off from the
stiffener for cars, whereby the roof structure is prevented
from being deformed.
Also, the present invention provides a laminated sheet
used for the above bonded matter, wherein at least a
contractile film and a peelable layer are laminated in this
order, and the peelable layer is bonded to one member; and
when the bonded matter is heated, the peelable layer is peeled
off from the above member (first embodiment); a laminated
sheet in which at least a contractile film, a peelable layer,
a base material and an adhesive layer are laminated in this
order and in which when the bonded matter is heated, the
peelable layer is peeled off from the base material (second
embodiment); and a laminated sheet in which at least a
contractile film, a second adhesive layer, a base material B,
a peelable layer, a base material A and a first adhesive layer
are laminated in this order and in which when the bonded
matter is heated, the peelable layer is peeled off from the
base material A (third embodiment).
Further, the present invention provides a use method of a
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laminated sheet, characterized by sticking a peelable layer
surface or an adhesive layer surface in the laminated sheet of
the present invention on one surface side of one member,
adhering a contractile film surface of the laminated sheet to
the other member with an adhesive and bonding one member to
the other member.
[0006]
Use of the laminated sheet and the bonded matter of the
present invention makes it possible to release bonding when
heated. It is suited to, for example, a roof structure, and
use thereof for a part in which a stiffener for cars is bonded
to a roof makes it possible to prevent the members from being
deformed.
Brief Explanation of the Drawings
[0007]
Fig. 1 is an outline cross-sectional drawing showing the
first embodiment in the laminated sheet of the present
invention.
Fig. 2 is an outline cross-sectional drawing showing the
second embodiment in the laminated sheet of the present
invention.
Fig. 3 is an outline cross-sectional drawing showing the
third embodiment in the laminated sheet of the present
invention.
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Fig. 4 is an outline drawing showing a use method using
the laminated sheet of the present invention and an example in
which the layer is peeled off.
Fig. 5 is an outline drawing showing a state in which the
contractile film in the laminated sheet of the present
invention contracts.
Fig. 6 is an outline drawing for explaining a peeling
force test method in the examples and the comparative examples.
Fig. 7 is an outline cross-sectional drawing showing the
roof structure of the present invention.
EXPLANATION of CODES
[0008]
1, 10, 20: Laminated sheets
2: Contractile film
3: Peelable layer
4: Base material
4': Base material A
5: Adhesive layer
5': First adhesive layer
6: Second adhesive layer
7: Base material B
31: Upper member (roof steel plate)
32: Adhesive (mastic sealer)
33: Lower member (stiffener)
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BEST MODE FOR CARRYING OUT THE INVENTION
[0009]
The bonded matter of the present invention is a bonded
matter prepared by bonding a first member to a second member
with a laminated sheet, wherein a contractile film
constituting the above laminated sheet contracts when the
bonded matter is heated, and a part of the laminated sheet is
peeled off or the laminated sheet is peeled off from either of
the members, whereby the bonded matter is prevented from being
deformed.
As shown in, for example, Fig. 7, the bonded matter is
used as a roof structure prepared by bonding a stiffener 33
for cars and a roof 31 for cars via a mastic sealer 32 and a
laminated sheet 1, 10, 20, wherein when the above roof
structure is heated, a part of the laminated sheet 1, 10, 20
is peeled off or the laminated sheet 1 is peeled off from the
stiffener 33 for cars, whereby the roof structure is prevented
from being deformed.
The members described above are preferably members for
cars, and the member and the member different from the above
member are preferably a stiffener for cars and a roof for cars.
In addition thereto, the bonded matter of the present
invention can be used as well for members of ships, electric
trains and the like in the fields of traffic, transportation
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and the like.
[0010]
In the laminated sheet 1 of the present invention used
for the bonded matter described above, at least a contractile
film 2 and a peelable layer 3 are laminated, as shown in Fig.
1, in this order as the first embodiment, and when the bonded
matter prepared by using the above laminated sheet 1 is heated,
the peelable layer 3 is peeled off from a member 33.
In the second embodiment, a laminated sheet 10 is
prepared by laminating, as shown in Fig. 2, at least a
contractile film 2, a peelable layer 3, a base material 4 and
an adhesive layer 5 in this order, and when a bonded matter
prepared by using the above laminated sheet 10 is heated, the
peelable layer 3 is peeled off from the base material 4.
In the third embodiment, a laminated sheet 20 is prepared
by laminating, as shown in Fig. 3 and 4, at least a
contractile film 2, a second adhesive layer 6, a base material
B 7, a peelable layer 3, a base material A 4' and a first
adhesive layer 5' in this order, and when a bonded matter
prepared by using the above laminated sheet 20 is heated, the
peelable layer 3 is peeled off from the base material A 4'.
In Fig. 2 and 3, the mark > shows a place where the
layers are peeled off.
[0011]
The contractile film 2 used in the present invention
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shall not specifically be restricted as long as it has a heat
resistance, a chemical resistance and a durability and is
provided with a contactility exerted by heating, and used are
polyester films comprising polyethylene terephthalate resins,
polybutylene terephthalate resins and the like, vinyl chloride
films and the like. The contractile film 2 which is liable to
be adhered to a mastic sealer, an adhesive layer and a
peelable layer each described later has to be used.
Among the contractile films 2 described above, the films
having a larger contraction percentage in one direction than a
contraction percentage in the other direction are particularly
preferred, and a contraction percentage thereof (95'C) in one
direction is 30 % or more, preferably 30 to 90 % and
particularly preferably 40 to 80 %. If the contraction
percentage in the other direction is the same as the
contraction percentage in one direction described above, the
mastic sealer provided on the contractile film protrudes in a
certain case. Accordingly, the contraction percentage in the
other direction is 20 % or less, preferably 15 - or less.
The term "one direction" in the above case shows either
longitudinal or lateral direction of the laminated sheet
(rectangular), and the term "the other direction" shows a
direction different by 90 degrees from above one direction.
A shape of the contractile film 2 observed when it
contacts due to heat includes a corrugate shape shown in Fig.
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(a) which is observed from a side part and a shape which is
warped in a semicircular form as shown in Fig. 5 (b), and it
shall not specifically be restricted.
[0012]
In the present invention, the contractile film 2 can be
subjected, if desired, on one surface or both surfaces to
surface treatment by an oxidation method, a roughening method
and the like for the purpose of enhancing an adhesive property
with an adhesive layer and a peelable layer described later
which are provided on the contractile film. The oxidation
method described above includes, for example, corona discharge
treatment, plasma treatment, chromic acid treatment (wet), UV
ray irradiation treatment and the like, and the roughening
method includes, for example, a sand blast method, a solvent
treating method and the like. The above surface treating
methods are suitably selected according to the kind of the
base material. Further, the contractile film subjected on one
surface or both surfaces to primer treatment can be used as
well.
A thickness of the contractile film 2 shall not
specifically be restricted, and the film having a thickness of
20 to 100 pm is used considering a contractile force, a heat
resistance and a durability.
[0013]
The base material 4, the base material A 4' and the base
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material B 7 which are used for the laminated sheet of the
present invention shall not specifically be restricted as long
as they have a heat resistance, a chemical resistance and a
durability, and used are polyester films comprising
polyethylene terephthalate resins, polyethylene naphthalate
resins, polybuhylene terephthalate resins and the like,
polypropylene films, polyamide films, polyimide films, metal
foils and the like.
Further, the base material 4, the base material A 4' and
the base material B 7 can be subjected, if desired, on one
surface or both surfaces to surface treatment by an oxidation
method, a roughening method and the like for the purpose of
enhancing an adhesive property with an adhesive layer and a
peelable layer described later which are provided on the base
materials. The oxidation method described above includes, for
example, corona discharge treatment, plasma treatment, chromic
acid treatment (wet), flame treatment, hot blast treatment,
ozone-UV ray irradiation treatment and the like, and the
roughening method includes, for example, a sand blast method,
a solvent treating method and the like. The above surface
treating methods are suitably selected according to the kind
of the base materials, and in general, the corona discharge
treating method is preferably used in terms of effects and an
operability. Further, the base materials subjected on one
surface or both surfaces to primer treatment can be used as
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well.
A thickness of the base material 4, the base material A
4' and the base material B 7 shall not specifically be
restricted, and the base materials having a thickness of 10 to
200 pm is used considering a heat resistance, a durability and
the like.
[0014)
The peelable layer 3 which is a pivot in the present
invention has two functional forms.
One is the property that it is peeled off from the other
materials strongly following the contractile film 2 or the
base material B 7. In this case, an self-adhesive resin
comprising a so-called acryl resin, a silicone resin having a
large film thickness and the like is preferably bused.
In a case of using, for example, an self-adhesive resin
comprising an acryl resin, a silicone resin having a large
film thickness and the like, the self-adhesive resin is coated
directly on the base material B 7 which is intended to be
improved in adhesion to form the peelable layer 3 and then
laminated on the other base material A 4', and the base
material is peeled off, whereby the peelable layer 3 comes to
follow, due to a difference in an adhesive property, the base
material B 7 on which the peelable layer 3 is formed.
Incidentally, means such as providing an anchorcoat layer,
carrying out corona treatment and the like can be used as well
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in order to expedite more the effects thereof.
Further, a method for reducing the adhesive property by
partially forming a plane form stuck on the base material A 4'
for the peelable layer 3 on a surface in which an adhesive
property is weakened can be used as well.
In the other functional form, the peelable layer 3 is
broken within the layer and divided into two layers. In this
case, 10 to 150 parts by mass of particles such as silica,
glass beads and the like having a particle size of 0.1 to 5 pm
is blended with 100 parts by mass of a binder resin such as an
acryl resin, a cellulose resin, a polyester resin, a urethane
resin and the like to prepare a composition, and a layer
formed from the composition prepared above in a thickness of 1
to 20 pm is used.
[0015)
The adhesive layer 5, the first adhesive layer 5' and
the second adhesive layer 6 shall not specifically be
restricted as long as they have a heat resistance, a chemical
resistance, a durability and a strong adhesive property, and a
pressure-sensitive adhesive composition comprising a pressure-
sensitive adhesive as a principal agent can be used.
The pressure-sensitive adhesive includes, for example,
acryl base pressure-sensitive adhesives, polyester base
pressure-sensitive adhesives, urethane base pressure-sensitive
adhesives, silicone base pressure-sensitive adhesives and the
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like. In particular, the acryl base pressure-sensitive
adhesives are preferably used from the viewpoint of a sticking
aptitude to a metal base adherend (a member 33 in Fig. 4).
When the pressure-sensitive adhesive is, for example, an
acryl base pressure-sensitive adhesive, it can be constituted
from a polymer or a copolymer comprising principally a main
monomer component for providing an adhesive property, a
comonomer component for providing an adhesive property and a
cohesive force and a functional group-containing monomer
component for improving a cross-linking point and an adhesive
property.
The main monomer component includes, for example,
acrylic acid alkyl esters such as ethyl acrylate, butyl
acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate,
cyclohexyl acrylate, benzyl acrylate, methoxyethyl acrylate
and the like and methacrylic acid alkyl esters such as butyl
methacrylate, 2-ethylhexyl methacrylate, cyclohexyl
methacrylate, benzyl methacrylate and the like.
The comonomer component includes, for example, methyl
acrylate, methyl methacrylate, ethyl methacrylate, vinyl
acetate, styrene, acrylonitrile and the like.
The functional group-containing monomer component
includes, for example, carboxyl group-containing monomers such
as acrylic acid, methacrylic acid, malefic acid, itaconic acid
and the like, hydroxyl group-containing monomers such as 2-
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hydroxyethyl acrylate, hydroxyethyl methacrylate, 2-
hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, N-
methylolacrylamide and the like, acrylamide, methacrylamide,
glycidyl methacrylate and the like.
The pressure-sensitive adhesive composition is improved
in a pressure-sensitive adhesive force and a cohesive force by
adding the above respective components. Usually, the above
acryl base resins do not have unsaturated bonds in a molecule
and therefore can be improved in a stability against light and
oxygen. Further, suitable selection of the kind of the
monomers and the molecular weight makes it possible to obtain
the pressure-sensitive adhesive composition provided with a
quality and characteristics according to uses.
[0016]
The composition of either of a cross-linking type
subjected to cross-linking treatment and a non-cross-linking
type subjected to no cross-linking treatment may be used for
the above pressure-sensitive adhesive composition, and the
composition of the cross-linking type is more preferred. When
the composition of the cross-linking type is used, the
adhesive layer having more excellent cohesive force can be
formed.
A cross-linking agent used for the cross-linking type
pressure-sensitive adhesive composition includes epoxy base
compounds, isocyanate compounds, metal chelate compounds,
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metal alkoxides, metal salts, amine compounds, hydrazine
compounds, aldehydes compounds and the like. A use amount of
the cross-linking agent is selected in a range of usually 0.1
to 10 parts by mass, preferably 0.5 to 5 parts by mass based
on 100 parts by mass of the pressure-sensitive adhesive
described above.
Various additives, for example, an antioxidant, a
tackifier, a UV absorber, a light stabilizer, a coupling agent,
a filler, a colorant and the like can be added to the above
pressure-sensitive adhesive composition as long as the objects
of the present invention are not damaged.
(0017]
Also, the adhesive layer 5 and the first adhesive layer
5' may be a magnetic adhesive layer comprising a magnetic
adhesive composition containing a mixture of a hot melt
adhesive and a ferromagnetic substance in addition to the
pressure-sensitive adhesive composition described above.
If the above magnetic adhesive layer is used as the
adhesive layer 5, the laminated sheet can be bonded to the
member by a magnetic force.
The hot melt adhesive described above is an adhesive
which has a tack or scarcely has a tack at ordinary
temperature and which is softened by heating to exert an
adhesive property and is solidified by cooling to ordinary
temperature to exhibit adhesion, and it includes polyolefin
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resin base hot melt adhesives, polyester resin base hot melt
adhesives and the like. When applied to a surface of an
adherend on which oil is coated, a polyolefin resin base hot
melt adhesive is particularly preferred.
[0018]
The specific examples of the polyolefin resin base hot
melt adhesives include propylene-ethylene-butene-1 copolymers,
ethylene-vinyl acetate copolymers s and the like.
The specific examples of the polyester resin base hot
melt adhesives include polycondensation products of a
dicarboxylic acid component and a diol component. The
dicarboxylic acid component includes terephthalic acid,
isophthalic acid, lower alkyl esters thereof, malonic acid,
succinic acid, adipic acid, sebacic acid and the like. The
diol component includes ethylene glycol, 1,3-propanediol, 1,4-
butanediol, 1,5-pentanediol, 1,6-hexanediol, diethylene glycol,
triethylene glycol, polyethylene glycol, cyclohexanedimethanol,
neopenty]. glycol, polytetramethylene glycol and the like.
Each at least one of the above dicarboxylic acid components
and diol components is used to obtain the polyester resin base
hot melt adhesives.
A melting point of the hot melt adhesive is preferably 90
to 200'C, more preferably 110 to 180 C.
[0019]
The ferromagnetic substance described above is a
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substance which can be spontaneously magnetized without having
an external magnetic field, and ferromagnetic substances are
included therein as well. To be specific, it includes ferrites
such as iron, cobalt, nickel, barium ferrites, strontium
ferrite and the like, rare earth metal magnetic substances
such as rare earth metal cobalt magnets and the like and
alnico magnets- Among them, the ferrites are preferred in
order to finely control an initial magnetism.
The ferromagnetic substance is preferably a powder
(hereinafter called a magnetic powder). An average particle
diameter of the magnetic powder is preferably 0.5 to 20 pm,
more preferably 0.5 to 15 um and particularly preferably 1 to
Pm.
A mixing proportion of the magnetic powder is preferably
100 to 400 parts by mass, more preferably 120 to 350 parts by
mass and particularly preferably 150 to 300 parts by mass
based on 100 parts by mass of the hot melt adhesive.
[00201
The magnetic powder is dispersed in the hot melt adhesive
preferably by mixing the hot melt adhesive with the magnetic
powder under heating. The heating temperature is preferably
100 to 220 C, more preferably 120 to 100 C. The above heating
temperature is preferably higher by 10 C or higher, more
preferably by 20 to 70 C than a melting temperature of the hot
melt adhesive. Mixing them in the above temperature range
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makes it possible to evenly disperse the magnetic powder in
the hot melt adhesive and prevent the hot melt adhesive from
changing in a quality.
[0021]
The magnetic adhesive layer described above exerts a
desired adhesive performance in a state in which the magnetic
powder in the adhesive composition is magnetized. Accordingly,
the hot melt may be mixed with the magnetic powder which is
magnetized or the hot melt may be mixed with the magnetic
powder which is not magnetized. In the latter case, the
magnetic powder can be magnetized (polarized) after mixing. It
can be magnetized by a known method. When mixing the hot melt
adhesive with the magnetic powder under heating, the magnetic
powder is demagnetized in a certain case, but in such case,
the magnetic powder can be magnetized once again
The magnetic adhesive composition described above can
suitably be blended with at least one of a tackifier, an
antioxidant, a filler, a dispersant and the like. The adhesive
composition of the present invention does not preferably
contain a foaming agent in order to maintain a high adhesive
strength.
[0022]
The magnetic adhesive layer described above has a
shearing force of 20 N or more, preferably 40 N or more after
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adhered under heating (150 C for 10 minutes).
In the above case, the shearing force after adhered under
heating (150'C for 10 minutes) shows a shearing force of the
adhesive sheet to a stainless steel plate, wherein a release
sheet of the obtained adhesive sheet provided with the base
material is removed, and the adhesive layer is stuck on the
stainless steel plate (thickness: 3 mm) at ordinary
temperature; and it is heated at 150'C for 10 minutes and then
cooled down to ordinary temperature to measure a shearing
force according to JIS 106650. The test speed is set to 300
mm/minute.
[0023)
The magnetic adhesive layer used in the present invention
has a surface magnetic force of preferably 20 mT or more, more
preferably 25 to 100 mT at ordinary temperature. In this
connection, the surface magnetic force at ordinary temperature
shows a surface magnetic force measured by means of a gauss
meter (trade name: 5080 type Handy Gauss Meter, manufactured
by Toyo Technical Co., Ltd.) at ordinary temperature at a
distance apart by 1 cm from a surface of the magnetic adhesive
layer in the obtained adhesive sheet provided with the base
material from which a release sheet is removed.
Further, the magnetic adhesive layer described above has
a surface magnetic force of preferably less than 5 mT, more
preferably 3 mT or less and most preferably 1.5 mT or less
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after heating. A lower limit value of the surface magnetic
force is 0.
In the above case, the surface magnetic force after
heating shows a surface magnetic force measured at a distance
apart by 1 cm from a surface of the magnetic adhesive layer by
means of the gauss meter described above after heating at
150 C for 40 minutes, then cooling down to ordinary
temperature and removing the release sheet.
[0024]
As described above, the magnetic adhesive layer used in
the present invention has a strong surface magnetic force at
ordinary temperature before heating and has a tack or scarcely
has a tack. Accordingly, the magnetic adhesive layer can be
stuck on an adherend comprising metal only by a surface
magnetic force thereof, and even it positioning thereof is
mistaken, it can readily be corrected. Further, the magnetic
adhesive layer described above exerts a strong adhesive force
by heating and therefore is adhered firmly on an adherend
comprising metal, and a surface magnetic force thereof can be
reduced by heating, so that an effect of the magnetic force to
human bodies and electronic devices can be inhibited to the
utmost.
[0025]
In the present invention, the adhesive layer may be
formed by coating the adhesive composition directly on one
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surface of the base material described above, or the adhesive
composition is coated directly on a release-treated surface of
a release sheet described later and dried to form an adhesive
layer, and then it may be stuck on one surface of the base
material. A forming method of the adhesive layer shall not
specifically be restricted, and various methods can be used
and include, for example, an air knife coater, a blade coater,
a bar coater, a gravure coater, a roll coater, a curtain
coater, a die coater, a knife coater, a roll knife coater, a
screen coater, a Mayer bar coater, a kiss coater and the like.
A thickness of the adhesive layers 5, 5' and 6 is usually
to 100 pm, preferably 15 to 60 pm when the pressure-
sensitive adhesive is used, and it is usually 5 to 400 m,
preferably 10 to 300 pm when the magnetic adhesive composition
is used.
Further, in the present invention, a layer such as a
readily adhesive lay and the like may be provided, if
necessary, between the base material and the adhesive layers
each described above.
[0026]
The surfaces of the adhesive layers 5, 5' are preferably
covered with the release sheets until before used in order to
protect them. Any materials may be used for the above release
sheet, and capable of being used are, for example, materials
in which used as base materials are films comprising various
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resins such as polyethylene terephthalate, polybutylene
terephthalate, polyethylene, polypropylene, polyallylate and
the like and various paper materials such as polyethylene-
laminated papers, polypropylene-laminated papers, clay-coated
papers, resin-coated papers, glassine papers, woodfree papers
and the like and in which a bonded surface between the above
base material and the adhesive layer is subjected, if
necessary, to release treatment. In the above case, the
representative example of the release treatment includes
formation of a release agent layer comprising a release agent
such as a silicone base resin, a long chain alkyl base resin,
a fluorine base resin and the like.
A thickness of the release sheet shall not specifically
be restricted and can suitably be selected.
[0027]
Next, a use method for the laminated sheet of the present
shall be explained with reference to Fig. 4. Fig. 4 shows an
embodiment in which the laminated sheet 20 shown in Fig. 3 is
used.
First, the laminated sheet 20 is stuck, as shown in Fig.
4 (a), on a surface of a lower member (stiffener) 33 with a
first adhesive layer 5'. An adhesive (mastic sealer) 32 is
coated on a bonded part of an upper member (roof steel plate)
31, and then the upper member is adhered, as shown in Fig. 4
(b), on the laminated sheet 20 and bonded by adhesion of the
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mastic sealer 32. Various washing and coating steps are
carried out in this state. In the above state, the roof steel
plate 31 and the stiffener 33 stay in a bonding state by the
mastic sealer 32.
Next, when heated in the drying step, a contractile film
2 of the laminated sheet 20 contracts, and a contractile force
thereof is exerted up to a peelable layer 3. The mastic sealer
32 is firmly adhered, as shown in Fig. 4 (c), to the
contractile film 2 of the laminated sheet 20, and the peelable
layer 3 of the laminated sheet 20 is peeled off from a base
material A 4', so that as a result thereof, the roof steel
plate 31 is peeled off from the base material A 4'in a form in
which the roof steel plate is accompanied by the mastic sealer
32 and the contractile film 2, the second adhesive layer 6,
the base material B 7 and the peelable layer 3 of the
laminated sheet 20.
The mastic sealer 32 shall not specifically be restricted,
and commercially available products shown in the patent
document 1 can be used.
In the explanations described above and Fig. 4, the
mastic sealer 32 is coated and formed on the roof steel plate
31 and bonded to the stiffener 33, but the mastic sealer 32
may be coated and formed on the contractile film 2 of the
laminated sheet and then bonded to the roof steel plate 31.
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EXAMPLES
[0028]
The present invention shall be explained in further
details with reference to examples, but the present invention
shall by no means be restricted by these examples.
In the following examples and comparative examples, a
peeling force test was carried out in the following manner.
Peeling force test:
A laminated sheet (length; 100 mm, width: 25 mm) was
stuck, as shown in Fig. 6 (a), by an adhesive layer on a
central part of a SUS (stainless steel) plate having a length
of 150 mm, a width of 70 mm and a thickness of 1.0 mm which
had mounting holes at four corners. A mastic sealer 5 g was
provided in a width of 10 mm, a length of 80 mm and a
thickness of 5 mm on a central part of a SUS plate having a
length of 180 mm (an end part 30 mm was bent at an angle of 30
degrees), a width of 70 mm and a thickness of 0.8 mm which had
mounting holes as well at four corners so that the mastic
sealer was located at a central part of the laminated sheet
described above.
Then, the SUS plate on which the mastic sealer was
coated was superposed thereon, as shown in Fig. 6 (b), so that
the mastic sealer was located on the laminated sheet, and
washers having a thickness of 3 mm were fit to the mounting
holes to fix both ends thereof with bolts. This plate was put
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in an oven of 150'C and left standing for one hour to cure the
mastic sealer.
Next, the above plate was left standing, as shown in Fig.
6 (c), for one hour on the conditions of 23'C and 50 % RH, and
the mounting bolts at the four corners were removed. Then, the
SUS plate at a laminated sheet side was fixed, and an end part
of the SUS plate at an opposite side thereof was peeled off at
a speed of 300 mm/minute by means of a tensile test device to
measure the peeling force.
[0029]
Example 1 (first embodiment (refer to Fig. 1))
A polyethylene terephthalate film (trade name: Space
Clean S7042, manufactured by Toyobo Co., Ltd.) having a
thickness of 50 pm was used as the contractile film. one
direction contraction percentage of Space Clean was 55 %, and
the other direction contraction percentage was 5 % (warm water
95'C X 10 seconds).
Further, SP-BLK AO (trade name, manufactured by LINTEC
Corporation) was used as the release sheet, and a weak
adhesibility type adhesive layer (trade name: MA, acryl base
adhesive, manufactured by LINTEC Corporation) having a dry
thickness of 30 um was formed on a release sheet surface by
partial coating so that an alternate stripe form in which a
width of an adhesive-coated part was 5 mm and in which a width
of a non-coated part was 3 mm was obtained, whereby a peelable
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layer was obtained. Then, the contractile film described
above was stuck on the peelable layer surface thereof to
prepare a laminated sheet.
Results obtained by subjecting the laminated sheet
(length: one direction, width: the other direction) obtained
above to the peeling force test described above are shown in
Table 1.
[0030)
Example 2 (second embodiment (refer to Fig. 2))
SP-SLK AO (trade name, manufactured by LINTEC
Corporation) was used as the release sheet, and a strong
adhesibility type adhesive layer (trade name: PA-T1, acryl
base adhesive, manufactured by LINTEC Corporation) having a
dry thickness of 30 pm was formed on a release sheet surface
by whole area coating. Then, the adhesive layer of the
laminated sheet provided with an adhesive layer was laminated
on a polyethylene terephthalate film (trade name: Lumirror #50,
manufactured by Toray Industries, Inc.) having a thickness of
50 pm used as the base material.
Then, the peelable layer of the laminated sheet prepared
in Example 1 was stuck on the polyethylene terephthalate film
described above to prepare a laminated sheet.
Results obtained by subjecting the laminated sheet
obtained above to the peeling force test described above are
shown in Table 1.
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(0031]
Example 3 (third embodiment (refer to Fig. 3))
A peelable layer comprising a silicone base resin (100
parts by mass of trade name; X-62-1347, linear
polyorganosilicone having vinyl groups at both ends, 2 parts
by mass of trade name: CAT-PL-56, a platinum catalyst, both
manufactured by Shin-Etsu Chemical Co., Ltd.) having a
thickness of 25 pm was formed on the polyethylene
terephthalate film (trade name: Lumirror #50, manufactured by
Toray Industries, Inc.) having a thickness of 50 pm used as
the base material B. Further, an adhesive layer (trade name:
PA-TI, acryl base adhesive, manufactured by LINTEC
Corporation) having a dry thickness of 30 pm was formed on the
polyethylene terephthalate film (trade name: Lumirror #50,
manufactured by Toray Industries, Xnc.) having a thickness of
50 pm used as the base material A. The release sheet (trade
name: SP-8LK AO, manufactured by LINTEC Corporation) was stuck
on the adhesive layer.
Then, the peelable layer surface of the base material B
was stuck on the polyethylene terephthalate film of the base
material A described above to prepare a laminated matter.
Next, SP-8LK AO (trade name, manufactured by LINTEC
Corporation) was used as the release sheet, and an adhesive
layer (trade name: PK, acryl base adhesive, manufactured by
LINTEC Corporation) having a dry thickness of 30 um was formed
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on a release sheet surface thereof by whole area coating.
Then, the polyethylene terephthalate film (trade name: Space
Clean S7042, manufactured by Toyobo Co., Ltd.) having a
thickness of 50 pm was stuck thereon as the contractile film.
Then, the release sheet attached to one side of Space
Clean S7042 described above was removed, and an exposed
adhesive layer surface thereof was stuck on the base material
S of the laminated matter described above to prepare a
laminated sheet.
Results obtained by subjecting the laminated sheet
obtained above to the peeling force test are shown in Table 1.
[0032]
Example 4 (second embodiment (refer to Fig. 2), magnetic
adhesive layer)
(1) Preparation of magnetic adhesive composition:
A mixer (trade name: T. K. HIVIS MIX 2P-l, manufactured
by PRIMIX Corporation) was charged with 200 parts by mass of a
strontium ferrite powder (average particle diameter: 2 pm) as
a magnetic powder and 100 parts by mass of a polyester resin
base hot melt adhesive (trade name: Polyester SP-165, melting
temperature: 130 C, manufactured by Nippon Synthetic Chemical
Industry Co., Ltd.), and they were mixed for 40 minutes under
heating at 160'C to obtain a magnetic adhesive composition.
(2) Preparation of adhesive sheet:
An extruding machine was charged with the magnetic
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adhesive composition prepared in (1) to extrude a magnetic
adhesive layer having a thickness of 250 pm from a die thereof
at an extruding temperature of 160'C, and the above magnetic
adhesive layer was laminated on a surface of a release sheet
of a polyethylene terephthalate resin sheet (trade name: SP-
PET 100 (T), thickness: 100 pm, manufactured by LINTEC
Corporation) subjected on a surface thereof to silicon release
treatment. Immediately thereafter, a base material sheet
(trade name: Lumirror #100T60, polyethylene terephthalate
resin sheet, thickness: 100 pm, manufactured by Toray
Industries, Inc.) was stuck on a surface of the magnetic
adhesive layer, and it was cooled down to room temperature.
Next, it was magnetized on the conditions of a voltage of 500
V and a current of 8 kA by means of a high pressure condenser
magnetization demagnetization electric source equipment (trade
name: PC2520ND, manufactured by Magnet Labo Co., Ltd.) to
prepare an adhesive sheet provided with a base material. The
shearing force after heated and adhered was 120 N, and the
surface magnetic force was 30 mT at room temperature and 0 mT
after heated.
(3) Preparation of laminated sheet:
The polyethylene terephthalate film described above
(trade name: Space Clean S7042, manufactured by Toyobo Co.,
Ltd.) having a thickness of 50 pm was used as the contractile
film.
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Further, SP-8LK AO (trade name, manufactured by LINTEC
Corporation) was used as the release sheet, and the weak
adhesibility type adhesive layer (trade name: MA, acryl base
adhesive, manufactured by LINTEC Corporation) having a dry
thickness of 30 pm was formed on a release sheet surface
thereof by partial coating so that an alternate stripe form in
which a width of an adhesive-coated part was 5 mm and in which
a width of a non-coated part was 3 mm was obtained, whereby a
peelable layer was obtained. Then, the contractile film
described above was stuck on the peelable layer surface
thereof to prepare a laminated matter.
Next, the peelable layer of the laminated matter
described above was stuck on a base material sheet of the
adhesive sheet to prepare a laminated sheet.
Results obtained by subjecting the laminated sheet
obtained above to the peeling force test are shown in Table 1.
[0033)
Example 5 (third embodiment (refer to Fig. 3), magnetic
adhesive layer)
(1) Preparation of magnetic adhesive composition:
The mixer (trade name: T. K. HIVIS MIX 2P-1,
manufactured by PRIMIX Corporation) was charged with 200 parts
by mass of a strontium ferrite powder (average particle
diameter: 2 pm) as a magnetic powder and 100 parts by mass of
a polyolefin resin base hot melt adhesive (trade name: Moresco
3l.
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Melt EP-167, melting temperature; 100'C, manufactured by
Matsumura Oil Research Corp.), and they were mixed for 40
minutes under heating at 160'C to obtain a magnetic adhesive
composition.
(2) Preparation of adhesive sheet:
An extruding machine was charged with the magnetic
adhesive composition prepared in (1) to extrude a magnetic
adhesive layer having a thickness of 250 pm from a die thereof
at an extruding temperature of 160'C, and the above magnetic
adhesive layer was laminated on a surface of a release sheet
of the polyethylene terephthalate resin sheet (trade name: SP-
PET-100 (T), thickness: 100 pm, manufactured by LINTEC
Corporation) subjected on a surface thereof to silicon release
treatment. Immediately thereafter, a base material A (trade
name: Lumirror #100T60, polyethylene terephthalate resin sheet,
thickness: 100 pm, manufactured by Toray Industries, Inc.) was
stuck on a surface of the magnetic adhesive layer, and it was
cooled down to room temperature. Next, it was magnetized on
the conditions of a voltage of 500 V and a current of 8 kA by
means of the high pressure condenser
magnetization-demagnetization electric source equipment (trade
name: PC252OND, manufactured by Magnet Labo Co., Ltd.) to
prepare an adhesive sheet provided with the base material A.
The shearing force after heated and adhered was 100 N, and the
surface magnetic force was 30 mT at room temperature and 0 mT
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after heated.
(3) Preparation of laminated sheet:
A peelable layer comprising the silicone base resin (100
parts by mass of trade name: X-62-1347, linear
polyorganosilicone having vinyl groups at both ends, 2 parts
by mass of trade name: CAT-PL-56, a platinum catalyst, both
manufactured by Shin-Etsu Chemical Co., Ltd.) having a
thickness of 25 pm was formed on the polyethylene
terephthalate film (trade name: Lumirror #50, manufactured by
Toray Industries, Inc.) having a thickness of 50 pm used as
the base material B.
Then, the adhesive sheet obtained in (2) in which the
magnetic adhesive layer was laminated on one surface of the
base material A was used to stick the peelable layer surface
of the base material B on the polyethylene terephthalate film
of the base material A described above, whereby a laminated
matter was prepared.
Next, SP-BLK AO (trade name, manufactured by LINTEC
Corporation) was used as the release sheet, and the adhesive
layer (trade name: PK, acryl base adhesive, manufactured by
LINTEC Corporation) having a dry thickness of 30 pm was formed
on the release sheet surface by whole area coating. Then, the
polyethylene terephthalate film (trade name: Space Clean 57042,
manufactured by Toyobo Co., Ltd.) having a thickness of 50 pm
was stuck thereon as the contractile film.
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Then, the release sheet attached to one side of Space
Clean 57042 described above was removed, and an exposed
adhesive layer surface thereof was stuck on the base material
B of the laminated matter described above to prepare a
laminated sheet.
Results obtained by subjecting the laminated sheet
obtained above to the peeling force test described above are
shown in Table 1.
[0034]
Comparative Example 1
SUS was bonded in the same manner as in Example 1,
except that in Example 1, the polyethylene terephthalate film
"Lumirror 450" (one direction contraction percentage: 0.3 %,
the other direction contraction percentage: 0.1 % (warm water
95 C X 10 seconds)) (trade name, manufactured by Toray
Industries, Inc.) having a thickness of 50 pm was used in
place of the contractile film.
Results obtained by subjecting the laminated sheet
obtained above to the peeling force test are shown in Table 1.
[0035]
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Table 1
Peeling force (N/25 mm)
Example 1 3.8
Example 2 3.5
Example 3 0.3
Example 4 4.7
Example 5 0.5
Comparative Example 1 8.5
[0036]
Example 6
The laminated sheet produced in Example 3 was stuck on a
stiffener 33 of a roof structure shown in Fig. 7, and a mastic
sealer 32 was coated between a roof 31 and the laminated sheet
to bond them. After subjected to electrodeposition coating,
the roof structure was dried at 150'C for one hour to find
that the peelable layer was peeled off, though bonded before
dried, from the base material A and that deformation was not
observed in the roof 31.
INDUSTRIAL APPLICABILITY
[0037]
As explained above in details, use of the laminated
sheet and the bonded matter according to the present invention
makes it possible to release bonding when heated. They are
suited to, for example, a roof structure, and use thereof for
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a bonded part between a stiffener for cars and a roof for cars
makes it possible to prevent the members from being deformed.
Further, the above laminated sheet and bonded matter can
be used as well for members of ships, electric trains and the
like in the fields of traffic, transportation and the like.
36
